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Practice question

MCQ

Question

For A₂(g) <=> 2A(g) , Kc = 0.36 at 300 K. If 0.5 mol A₂ is in a 1 L vessel, what is the degree of dissociation?

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Explanation

Initial: [A₂] = 0.5 M , [A] = 0 . Let α be the degree of dissociation, [A₂] = 0.5 (1 - α) , [A] = α . Kc = ([A]²/[A₂]) = ((α)²/0.5 (1 - α)) = 0.36 , α² = 0.18 (1 - α) , α ≈ 0.36 .

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